Plate VII. 



Transverse sections through the body-wall in the region of the oesophagus; fig. 5 in the region of the 

 cnido-glandular tract of the filaments, figs, i — 4 magnification ^/y Reichert's "Austria". Figures drawn 



on a level with the stage of the microscope. 



Fig. I of hozoaiiihiis davisi. 



— 2 - — islandicus. 



— 3 - — diihius. 



— 4 - — daiiiats. 



— 5 - Parazoantlms haddoni (from N. W. of Bergen, Matt son 1880) ^/j with drawn out tube. 



— 6 - — ? (from the Faeroes) 2/3 with drawn out tube. 



